Grant Brisbee wrote a good article about Cain at McCovey Chronicles.
He allowed fewer homers this year, which temporarily sated the xFIP hounds, but otherwise it was a very Cain year. As Cain as they get, except for the one before that and the one before that. He is freakishly consistent. Only five pitchers have thrown more than 200 innings with an above average ERA+ every season over the last five years:
Matt F. Cain
But Cain doesn't just have an above average ERA+ -- he's much better that. His lowest ERA+ since 2007 is 118. So if you up the ERA+ requirements on that list to pitchers with an ERA of 110 or better in those five seasons with 200 IP
Matt M.F. Cain